When running blendsrf between a nurbs’d subd and another nurbs, the initial starting points get twisted like crazy. Current workaround is change mode to position matching for 1and2, then realign the points, then go back to tan or curvature matching.
Thanks for the report, I see what you mean in a simple test here. It has to do with the point on the NURBS polysrf (converted from SubD) edge that is clicked for the edge selection. Does pick location make a difference for you? Pick your chain selection of that edge closer to the other NURBS srf edge.
Looks like it might be a blendsrf issue in the wip. I’m getting similar results when trying to blend regular nurbs. Will test a bit more to confirm.